I'm not sure about 'knackered' but certainly 'space challenged' J41s ex BACX will be on the route operated (probably) by extremely p****d-off BACX flight crew who have been 'seconded' to Eastern for probably as long as it takes to liberate Iraq.
The whole affair has been a complete disgrace from a personnel management angle and opinion has it that BACX have virtually given the J41 operation to Eastern with lease and training subsidy sweeteners and were not talking bucket loads of Canderel here!.